痈的成脓期大约是（）
A.3天左右
B.7天左右
C.10天左右
D.15天左右
E.不同部位成脓期不同
参考答案：B
The party was meant to be a surprise to everyone who would take part, but one of the
organizers____ the plan. [ ]
A. gave away
B. gave out
C. gave up
D. gave back
按照光量子假说，用光照射金属表面，电子就可以接受光子并获得能量，如果这份能量大于金属表子就会（）
A.运动
B.逸出金属表面
C.进入金属内部
